Audio amplifier



FIG. 1 is a top perspective of an audio amplifier.

FIG. 2 is a bottom perspective of the audio amplifier shown in FIG. 1.

FIG. 3 is a front view of the audio amplifier shown in FIG. 1.

FIG. 4 is a rear view of the audio amplifier shown in FIG. 1.

FIG. 5 is a top view of the audio amplifier shown in FIG. 1.

FIG. 6 is a bottom view of the audio amplifier shown in FIG. 1.

FIG. 7 is a right side view of the audio amplifier shown in FIG. 1; and,

FIG. 8 is left side view of the audio amplifier shown in FIG. 1.

The portions of the audio amplifier and the environment shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for an audio amplifier, as shown and described. 